Bullosa

Few water trumpets are as rarely seen in trade as Cryptocoryne bullosa, and the plants that do surface are usually kept as a test of patience. It is a rosette species from the freshwater streams of central Sarawak in Borneo, where it grows in soft, acidic water. Its narrow, gently wavy leaves stay short, reaching about 15 cm in the aquarium.

Flowgrow lists it as suitable only in restricted conditions and grades it as very difficult, but publishes no cultivation data for it, so the figures here are drawn from its habitat rather than from confirmed culture records. It is generally kept in soft water with a pH of 5 to 6, temperatures of 20 to 26 °C, and stable conditions, and CO₂ injection with a nutrient-rich substrate is what most keepers rely on to establish it. Like many crypts it stalls for weeks and may shed leaves before it settles.

This is not a plant for casual upkeep. It fits a dedicated softwater tank rather than a community tank, wants moderate light, and does best when established plants are left alone. Because wild-collected specimens are uncommon, most plants in circulation are older, well-rooted clumps that adapt slowly.